If you have the ppa installed for updates of libreoffice and the latest upgrade won't start because of an extension problem try the following:
chmod a+rx /usr/lib/libreoffice/share/uno_packages/cache/uno_packages
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If you have the ppa installed for updates of libreoffice and the latest upgrade won't start because of an extension problem try the following:
chmod a+rx /usr/lib/libreoffice/share/uno_packages/cache/uno_packages